Which step does fructose enter glycolysis after being phosphorylated?

Fructose enters glycolysis after being phosphorylated as fructose 6-phosphate. This occurs when fructose is first converted to fructose 1-phosphate by the enzyme fructokinase, then further processed into dihydroxyacetone phosphate and glyceraldehyde. The glyceraldehyde can be converted into glyceraldehyde 3-phosphate, which is an intermediate in glycolysis. However, fructose 6-phosphate is a key molecule in glycolysis, positioned just before the splitting of glucose into two three-carbon molecules, where it is further processed.

The priming steps of glycolysis refer to the early conversion of glucose into intermediates necessary for the energy extraction phase. Since fructose is converted and effectively enters the glycolytic pathway as fructose 6-phosphate, understanding this conversion's role is crucial. Priming indicates the preparatory phase where ATP is used to modify sugars before breakdown. Thus, the correct answer connects the metabolic pathway of fructose directly to its entry point in glycolysis.

Other options do not accurately represent the step where fructose enters glycolysis following phosphorylation, as fructose does not enter the pathway as glucose 6-phosphate or fructose 1,6-bisphosphate and does